7-way RV blade
Gooseneck and tag equipment trailers. Mirrored truck socket and trailer plug contact views, circuit functions, and two common harness color schemes.
4-way flat
Small utility trailer lighting. Ground, running lamps, and combined left/right stop-turn circuits. This connector carries lighting only.
Wire by verified function. Harness colors can vary. Match the connector view and terminal markings, then test each circuit. These are connector references with simplified routing; use the component manufacturer's instructions for wire gauge, fuses, brake controllers, breakaway systems and electric-over-hydraulic actuators. Wire sizes use AWG and routing distances use inches.
Connector reference: CURT trailer wiring guide. Updated October 4, 2026.